This name is a synonym of Sedum maximum subsp. ruprechtii (Jalas) Soó.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Kert. Kar Evk. 1953: 107 1953.
This name was in version 1 of The Plant List, record kew-2871614, and has not been changed.